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L. J. GENETT. AIR COMPRESSING PUMP.

Patented Sept. 15,1891.

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L. J. GENETT. AIR GOMPRBSSING PUM P. No. 459,685. Patented Sept, 15, 1891.

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LOUIS J. GENETT, OF MARQUETTE, MICHIGAN, ASSIGNOR OF THREE-FOURTHS TO MOSES L. ROTHSOHILD, OF .OHIOAGO, ILLINOIS, AND ISAAO NEW BERGER, OF MARQUETTE; MICHIGAN.

AlR-COMPRESSING PUMP.

SPECIFICATION forming part of Letters Patent No. 459,685, dated September 15, 1891.

Application filed November 1, 1890- Serial No. 370,014.

T at whom it may concern.-

Be it known that I, LOUIS J. GENETT, of Marquette, in the county of Marquette and State of Michigan, have invented a new and useful Improvement in Air Compressing Pumps, of which the following is a specification.

My invention consists in an improvement in air-compressing pumps, hereinafter full described and claimed.

Figure 1 is a plan view. Fig. 2 is a section on line a: 00, Fig. 1; and Fig. 3 is a central transverse sectional View.

A represents a pump-cylinder having a valve-chest B on one face thereof and resting on a base-plate R, to which it is secured by the bolt and nut 4.

T represents a piston-rod passing through a suitable stufling-box and engaging with the piston within cylinder A. The piston-rod T is intended to be actuated by a connectingrod (not shown) driven by any suitable source of power. Q represents a guide for the piston-rod T, a sliding sleeve S connecting the piston-rod with said guide. M and N represent ports at the ends of the cylinder opening from the valve-chest into the cylinder A for the entrance and exit of air into and from the cylinder.

I and J represent suction-valves which seat either by gravity, as shown in the drawings, or may be seated by springs, if desired. The passages which these valves close open tothe outer air.

0 and D represent discharge-valves which control passages from the ports M and N to the outlet-pipe P, which leads to a suitable reservoir for compressed air. (Not shown.)

Between the chambers of the valve-chests into which ports M and N open I form a cylinder X, in which fits a tight piston E, nor mally pressed to one end of the cylinder bya spiral spring F.

I-I represents a piston-rod secured to piston E and carrying on its outer end a collar L.

G Grepresenttwo oscillatory levers pivoted at their centers to lugs on the valve-chest, each of which is loosely pivoted to pins 5 and j,which extend loosely into the air-passages (No model.)

controlled by the suction-valves I. and J, respectively.

U represents a nut which screws into cylinder X, by means of which the tension of spring F may be regulated.

In the operation of an air-compressing pump it is desirable to have it compress air to a determined pressure and then to have the operation of the pump stop, although the motion of the piston may continue, and have the pump automatically resume operation when the pressure falls below the determined point. Itis also desirable while the pump is running but not compressing air toavoid heatingas far as possible, and these two objects are attained by my invention, the operation of which is as follows: Assuming the ports to be in position shown in Fig. 2 and the pistonrod T in motion from any source of power, the motion of said piston-rod to the right of Fig. 2 will draw air into the left hand of cylinder A through the ports N, the suctionvalve I rising freely to permit the entrance of air to said ports. At the same time the air in the'right-hand end of cylinder A is being forced out through ports M, as shown by the arrows, into the valve-chest, thus holding suction-valve J firmly to its seat and raising discharge-Valve D and causing the air to flow through pipe P into the reservoir. The reverse motion of piston-rod T will reverse this action, drawing external air into the cylinder through ports M and forcing compressed air through ports N and valve 0 into pipePand the reservoir. The air-pressure in the reservoir operates directly on piston E and produces no effect on said piston until the pressure of air on said piston becomes greater than the pressure of the springF on the other side of piston E. Then this occurs, the piston E will be moved by the air-pressure against the resistance of spring F, and will thus move the piston rod II and collar '1. This swings both levers G, forcing the pins 1' and j against the lower ends of the suction-valves I and J, respectively, thus unseating said valves I and J and throwing both ports M and N into free communication with the external air, so that any air forced out of cylinder A will pass freely out beneath valves I and J without passing into pipe P, and this action will continue until the air-pressure from the reservoir on pistonE becomes less than the pressure of spring F, when said spring will force the piston E upward and permit valves I and J to fall to their seats, when the normal action of the pump will be resumed. By this means when the pump is doing no work the cylinder A is constantly being filled with fresh cool air, thus removing any tendency to heat.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

l. The combination, with the cylinder and the suction and discharge valve chest of an air-compressing pump, of a pair of suctionvalves and a pair of discharge-valves arranged in the valvecl1est, a cylinder located in the valve-chest between the suction and discharge valves, a piston arranged in the cylinder exposed to the air-pressure created by the pump and held against said pressure by a spring, and levers actuated by the piston to simultaneously unseat the two suction-valves when an excess of air pressure moves the piston against the tension of the spring, substantially as described.

2. The combination, with the cylinder and the suction and discharge valve chest of an air-compressing pump, of a pair of suctionvalves and a pair of discharge-valves in the valvechest, a cylinder located within the valve-chest between the suction and discharge valves and opening at its upper portion into the ports leading from the discharge-Valves to the discharge-pipe, a piston arranged in the cylinder exposed to the air-pressure created by the pump and held against said air-pressure by a spring, and oscillating levers acting at one end upon the suction-valves and at the opposite end acted upon by the piston in its downward movement against the tension oi. the spring when an excess of pressure moves the piston, substantially as described.

The combination, with the cylinder and the discharge and suction valve chest of an air-compressing pump, of a pair of suctionvalves and a pair of discharge-valves in the valve-chest, a cylinder located within the valve-chest between the suction and discharge valves, a nut in one end of the cylinder, a piston arranged in the cylinder having a piston-rod passingthrough the nut and exposed to the air-pressure created by the pump, a spring interposed between the piston and the nut, a collar secured to the piston below the nut, and a pair of oscillating levers pivoted to the valve-chest and provided,respectively, with pivoted pins to lift the suction valves when the piston is moved downward against the tension of the spring by an excess of airpressure, substantially as described.

LOUIS J. GENEIT.

\Vitnesses:

GEORGE S. PAYsoN, Mosns L. Ro'rnsonnn). 

